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G-quadruplex ligands bind four-stranded structures that form in guanine-rich DNA and RNA sequences. Four guanines pair through Hoogsteen hydrogen bonds into a planar G-quartet, and stacked quartets are stabilized by potassium ions. Parallel four-stranded complexes of guanine-rich DNA were described in 1988. In 2013 a structure-specific antibody visualized G-quadruplexes in human cell nuclei, with numbers that changed during the cell cycle. Such structures occur at telomeres, in gene promoters and in ribosomal DNA. Pyridostatin, reported in 2008, stabilizes telomeric G-quadruplexes and triggers a DNA damage response there. 360A and MTR-106 are further stabilizing ligands, and BMVC-8C3O is a carbazole-based G-quadruplex ligand. Quarfloxin targets G-quadruplexes in ribosomal DNA and inhibits ribosomal RNA (rRNA) biogenesis.
BMVC-8C3O is a DNA G-quadruplexe (G4) ligand which can induce topological conversion of non-parallel to parallel forms in human telomeric DNA G4s.
Telomeric G4s ligand 1 is a telomeric G-quadruplex ligand known for its ability to stabilize telomeric G4 structures and promote R-loop formation, resulting in DNA damage responses. This compound has been shown to induce apoptosis in tumor cells and trigger immunogenic cell death (ICD), making it a valuable tool for cancer research and therapeutic applications.
G-quadruplex ligand 1 targets G-quadruplex structures in DNA, disrupting their stability. This ligand significantly enhances gene expression by altering the conformation of G-quadruplexes, making it a valuable tool for studies involving gene regulation and potential therapeutic applications. Its unique properties facilitate investigations into the roles of G-quadruplexes in cellular processes and disease mechanisms.
PT-ttpy is a metallo-organic complex that acts as a potent ligand for G-quadruplex structures. It effectively induces telomere-related DNA damage in cancer cells by inhibiting telomerase activity and disrupting telomere functions. Additionally, PT-ttpy is associated with various chromatin abnormalities during mitosis, including the formation of chromatin bridges, ultrafine bridges (UFBs), and double-stranded breaks (DSBs). This reagent is valuable for research in cancer biology and the study of telomere dynamics.
Telomeric G4s Ligand 2 is a selective ligand that targets telomeric G-quadruplex (G4) structures, exhibiting an IC50 value of 0.4 μM. This compound binds to dimeric telomeric G4 and inhibits the functions of DHX36 and BLM helicases. It activates both cGAS-STING and TERRA-ZBP1 pathways, leading to induction of autophagy and G2/M cell cycle arrest, demonstrating significant antiproliferative effects across various cancer cell lines. This reagent is useful for investigating mechanisms underlying colorectal cancer.
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SYUIQ-5 is a G-quadruplex ligand that specifically stabilizes G-quadruplex structures, thereby inducing cellular senescence. This compound inhibits the activity of the c-myc gene promoter, which is critical in tumorigenesis. Additionally, SYUIQ-5 promotes autophagy in cancer cells by causing telomere damage through the delocalization of TRF2 from telomeric regions, making it a valuable tool for investigating pathways related to cancer and aging.
N-Methylmesoporphyrin IX (NMM) is a potent fluorescent binder that targets G-quadruplex DNA, making it an effective probe for studying Aβ fibrillation. It serves as both an in situ inhibitor and an ex situ monitor of Aβ amyloidogenesis in vitro and within cellular contexts. NMM exhibits high sensitivity to G-quadruplex structures while showing negligible response to duplexes, triplexes, and single-stranded DNA. Additionally, it remains nonfluorescent in monomeric Aβ environments, producing strong fluorescence upon interaction with Aβ aggregates.
Carboxy pyridostatin trifluoroacetate salt is a G-quadruplex ligand that selectively interacts with G-quadruplex structures in RNA and DNA. This compound has been shown to decrease levels of ATF-5 protein, thereby inhibiting cell proliferation and disrupting stress granule formation. It serves as a valuable tool in the study of G-quadruplex biology and its implications in cellular stress responses and cancer research.
Carboxypyridostatin is a selective ligand for G-quadruplex structures. It demonstrates significant affinity for RNA G-quadruplexes, leading to the downregulation of ATF-5 protein levels. This compound is known to inhibit cell proliferation and interfere with stress granule formation, making it valuable for studies on cellular stress responses and G-quadruplex-related mechanisms in cancer research.
Synonyms: Methoxymorpholinyl doxorubicin hydrochloride; FCE 23762 hydrochloride; PNU 152243A
Nemorubicin hydrochloride is a doxorubicin derivative that primarily targets G-quadruplex structures. It exhibits notable antitumor activity by intercalating into duplex DNA while also serving as a potent ligand for G-quadruplex DNA segments, effectively stabilizing their conformation. This compound is valuable for research applications focused on understanding G-quadruplex biology and developing therapeutic strategies targeting this unique DNA structure.
